<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片区 -->
    <el-card>
      <!-- 警示区 -->
      <el-alert title="添加商品信息" type="info" center show-icon> </el-alert>
      <!--  步骤条 -->
      <el-steps
        :space="200"
        align-center
        :active="activeIndex - 0"
        finish-status="success"
      >
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- 标签页 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        label-position="top"
      >
        <el-tabs
          :tab-position="'left'"
          v-model="activeIndex"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <!-- 级联选择器 -->
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="cateProps"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <el-form-item
              :label="item.attr_name"
              v-for="item in manyTableDate"
              :key="item.attr_id"
            >
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox
                  border
                  :label="cd"
                  v-for="(cd, i) in item.attr_vals"
                  :key="i"
                ></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item
              :label="item.attr_name"
              v-for="item in onlyTableDate"
              :key="item.attr_id"
            >
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- 上传功能 -->
            <!-- action 表示图片要上传到的后台API地址 -->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headersObj"
              :on-success="handleSuccess"
            >
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品 -->
            <el-button type="primary" class="btnAdd" @click="add"
              >添加商品</el-button
            >
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 图片预览 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" alt="" class="previewImg" />
    </el-dialog>
  </div>
</template>

<script>
// 导入lodash
import _ from "lodash";

export default {
  data() {
    return {
      activeIndex: "0",
      // 添加商品的表单数据对象
      addForm: {
        goods_name: "",
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        // 图片的数组
        pics: [],
        // 商品的详情描述
        goods_introduce: "",
        // 保存商品的参数
        attrs: [],
      },
      //添加商品的表单数据对象验证规则
      addFormRules: {
        goods_name: [
          { required: true, message: "请输入商品名称", trigger: "blur" },
        ],
        goods_price: [
          { required: true, message: "请输入商品价格", trigger: "blur" },
        ],
        goods_weight: [
          { required: true, message: "请输入商品重量", trigger: "blur" },
        ],
        goods_number: [
          { required: true, message: "请输入商品数量", trigger: "blur" },
        ],
        goods_cat: [
          { required: true, message: "请输入商品分类", trigger: "blur" },
        ],
      },

      // 商品分类列表
      cateList: [],

      //商品分类配置项
      cateProps: {
        expandTrigger: "hover",
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },

      // 获取动态参数面板的数据
      manyTableDate: [],

      // 获取静态属性面板的数据
      onlyTableDate: [],

      // 上传图片的URL地址
      uploadURL: "http://127.0.0.1:8888/api/private/v1/upload",

      // 图片上传组件的headers请求头对象
      headersObj: {
        Authorization: window.sessionStorage.getItem("token"),
      },

      // 保存图片地址
      previewPath: "",

      // 图片对话框的显示隐藏
      previewVisible: false,
    };
  },

  created() {
    this.getCateList();
  },

  methods: {
    // 获取所有商品的分类数据
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类失败");
      } else {
        this.$message.success("获取商品分类成功");
        this.cateList = res.data;
        // console.log(this.cateList);
      }
    },

    // 级联选择器选中项变化会触发这个函数
    handleChange() {
      // console.log(this.addForm.goods_cat);
    },

    beforeTabLeave(activeName, oldActiveName) {
      // console.log('即将离开标签页的名称' + oldActiveName);
      // console.log('即将进入标签页的名称' + activeName);
      if (oldActiveName === "0" && this.addForm.goods_cat.length !== 3) {
        this.$message.error("请先选择商品分类");
        return false;
      }
    },

    // tab被选中时触发
    async tabClicked() {
      // console.log(this.activeIndex);
      if (this.activeIndex === "1") {
        // 动态参数面板
        // console.log('动态参数面板');
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: "many" },
          }
        );
        if (res.meta.status !== 200) {
          return this.$message.error("获取动态参数失败");
        } else {
          // console.log(res.data);
          res.data.forEach((item) => {
            item.attr_vals =
              item.attr_vals.length === 0 ? [] : item.attr_vals.split(" ");
          });
          this.manyTableDate = res.data;
          // console.log(this.manyTableDate);
        }
      }

      // 静态属性
      if (this.activeIndex === "2") {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: "only" },
          }
        );
        if (res.meta.status !== 200) {
          return this.$message.error("获取动态参数失败");
        } else {
          // console.log(res.data);
          this.onlyTableDate = res.data;
          console.log(this.onlyTableDate);
        }
      }
    },

    // 处理图片预览效果
    handlePreview(file) {
      // console.log(file);
      this.previewPath = file.response.data.url;
      // console.log(this.previewPath);
      this.previewVisible = true;
    },

    // 处理移除图片的操作
    handleRemove(file) {
      // console.log(file);
      // 1.获取将要删除图片的临时路径
      const filePath = file.response.data.tmp_path;
      // 2.从pics数组中，找到图片对应的索引值
      const i = this.addForm.pics.findIndex((x) => x.pic === filePath);
      // 3.调用数组的splice方法，把图片信息对象，从pics数组中移除
      this.addForm.pics.splice(i, 1);
      // console.log(this.addForm);
    },

    // 监听图片上传成功的事件
    handleSuccess(response) {
      // console.log(response);
      // 1.拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path };
      // 2.将图片信息对象，push到pics数组中
      this.addForm.pics.push(picInfo);
      // console.log(this.addForm);
    },

    //添加商品
    add() {
      // console.log(this.addForm);
      // validate  验证表单项
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) {
          return this.$message.error("请填写必要的表单项");
        } else {
          // 执行添加的业务逻辑
          // 级联选择器中goods_cat中为数组，这里要转换成字符串，产生歧义，要用深拷贝
          // lodash(包) 里面有一个方法可以做深拷贝 cloneDeep(obj)
          // 深拷贝
          const form = _.cloneDeep(this.addForm);
          form.goods_cat = form.goods_cat.join(",");
          // console.log(form);
          // 处理静态参数
          this.manyTableDate.forEach((item) => {
            const newInfo = {
              attr_id: item.attr_id,
              attr_value: item.attr_vals.join(" "),
            };
            this.addForm.attrs.push(newInfo);
          });
          //  处理静态属性
          this.onlyTableDate.forEach((item) => {
            const newInfo = {
              attr_id: item.attr_id,
              attr_value: item.attr_vals,
            };
            this.addForm.attrs.push(newInfo);
          });
          form.attrs = this.addForm.attrs;
          console.log(form);
          // 发起请求添加商品
          // 商品名称，必须是唯一的
          const { data: res } = await this.$http.post('goods', form);
          if (res.meta.status !== 201) {
            return this.$message.error("添加商品失败");
          } else {
            this.$message.success("添加商品成功");
            this.$router.push("/goods");
          }
        }
      });
    },
  },

  // 计算属性
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length == 3) {
        return this.addForm.goods_cat[2];
      }
      return null;
    },
  },
};
</script>

<style lang="less" scoped>
.el-checkbox {
  margin: 0 15px 0 0 !important;
}

.previewImg {
  width: 100%;
}

.btnAdd {
  margin-top: 15px;
}
</style>